[quote]”You can send SMS messages to your contacts’ mobile phones using Gmail Chat … Google does not charge for using this service,” according to information available with Google’s website.[/quote]

The SMS service is available in India and 51 other countries in Asia, Africa and North America.

According to the feature, people using either chat programmes ( GTalk, or Gmail chat ) can send texts to mobile users for free and cell phone subscribers can reply at regular SMS rates.

To ensure maximum coverage, the company has tied up with mobile service providers Aircel, Idea, Loop Mobile, MTS, Reliance, Tata DoCoMo, Tata Indicom and Vodafone in a few cities, including Delhi, Mumbai and Kolkata.

The service starts with 50 SMS credits for each user, every sent SMS costing one credit. Every reply received adds on 5 credits subject to the maximum level being 50 SMS at any given time. There is no official statement from Google on the launch of this service, however the service has gone live this evening in the chat windows of many users.

But don’t stress if you run out. “In case the SMS credit goes down to zero, it will increase automatically to one text after 24 hours. Keep in mind that if you’d like a higher message credit, you can always send an SMS to your own phone, and then reply to that message multiple times. Every time you reply, your SMS credit is increased by five. Effectively, you’re buying more messages by paying your phone company for these outgoing messages,” says Google in an explanatory post on its website.

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